Bridge



(No Modl.)

U. DODD.

BRIDGE GATE.

No. 336,843.! Patented Feb; 23. 18 86.

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N PETERS, Photo-Lithographer. Wuhingtom RC.

UNITED STATES PATENT OFFICE.

UNION DODD, OF SOUTH BEND, ASSIGNOR OF ONE-HALF TO \VILLIAM HOLLAND,PLYMOUTH, INDIANA.

BRIDGE'JGATE- SPECIFICATION forming part of Letters Patent No.336,843,dated February 23, 1886.

(No model.)

To all whom it may concern:

Be it known that I, UNION DODD, a citizen of the United States, residingat South Bend, in the county of St. Joseph and State of Indiana, haveinvented certain new and useful Improvements in Bridge-Gates, of whichthe following is a specification, to wit:

This invention relates to bridge-gates; and it consists in certainpeculiarities of the construction and arrangement of the same,substantially as will be hereinafter more fully set forth and claimed.

In order to enable others skilled in the art to which my inventionpertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the accompanying drawings, inwhich- Figure l is a front view ofa bridge-approach and my gate, andFig. 2 is a side elevation of the abutting ends of the bridge and itsapproach. Fig. 3 is a detail view of the spring.

a represents a swing draw-bridge of the usual or any desired form, and athe approach or abutment with which the bridge connects when closed.Upon the approach are placed the posts I), one at each side, and on oneof them are pivoted two long cross-bars, b, whichv are connected atintervals by pickets b, these pickets being connected to the crossbarsbya single pivotal pin or bolt, as shown. One of the cross-bars b isextended in rear of its post, and is provided with a rod or link, b,which extends down alongside of the abutment, and is connected to alever, c, the opposite end of which is pivoted upon the face of theabutment, as in Fig. 1. The free end of this lever is confined inaguide, c, in which it is free to move, as represented. Upon a suitablesupport, d, on the abutment is placed aflat spring, (1, ofconcavo-convex form, the ends of which are confined by bolts d", and oneor both ends are formed with slots d? to allow of the expansion of thespring when compressed. Ashort rod or bar, 6, connects the center of thespring d with the lever c, and when it is necessary an auxiliary spiralspring. 6, is placed around the rod beneath the mainspring to strengthenit passing over the mainspring compresses it, and by means of itsconnecting-rod depresses the lever c, the free end of which at oncedraws down the rear projecting end of the cross-bar and elevates thegate, the whole folding up, as seen by dotted lines in Fig. 1, as it iselevated. As the bridge is opened, the gate is allowed to fall andprotects the end of the abutment, as will be at once understood.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The combination, with a swing-bridge, of a compression spring on theabutment, a lever connected to said spring and also to the gate, and agate composed of parallel bars hinged at one end and connected bypickets pivoted thereon, substantially as and for the purpose set forth.

2. The combination, with the bridge a, of the gate b b theconnecting-rod b lever c, springs d e, and rod e, all constructed andarranged to operate substantially as and for the purpose set forth.

In testimony whereof I afifix my signature in presence of two witnesses.

UNION DODD.

\Vitnesses:

T. E. HOWARD, MosEs LIVINGSTON.

In use, when the bridge is closed, the end

